Verified answer

- 1/12 · 3/5 - 2/3 : (-10/9) = 11/20

1) - 1/12 · 3/5 = - (1·1)/(4·5) = - 1/20

2) 2/3 : (-10/9) = 2/3 · (-9/10) = - (1·3)/(1·5) = - 3/5

3) - 1/20 - (-3/5) = - 1/20 + 3/5 = - 1/20 + 12/20 = 12/20 - 1/20 = 11/20